Adjusting After Gas Valve Replacement Or In Case Of Gas Conversion (Case B); General Remarks; Case B Adjustments - Lochinvar TTW Series Installation, Commissioning And Maintenance Instructions

20.3

ADJUSTING AFTER GAS VALVE REPLACEMENT OR IN CASE OF GAS CONVERSION (CASE B)

In case of gas conversion, apply the corresponding
sticker at the appropriate position in the water
heater and mark the square for the used gas type.
Also, mark the square, indicating that the correct
value has been set for parameter P4BD.
(In the example below, 'propane' and 'P4BD = 1'
have been marked).
20.3.1

GENERAL REMARKS

As can be seen in the general scheme, the main adjusting steps in case B are the same as in case A, except for these extra steps:

set the right gas group; parameter P4BD (display D8)

a pre adjusting step, to make sure the burner will fire
All adjustments must result in CO
In case of gas conversion: check parameter P4BD for the correct setting.
20.3.2

CASE B ADJUSTMENTS

Pre adjusting the top burner:

Turn setting screw [2] of the upper gas valve clockwise until you feel resistance. This means that the valve is closed; do not try to
tighten the screw any further.

Now turn this screw counter clockwise (open), according to the number of turns in TABLE 14.2 for the used water heater and gas
type.
→ proceed according to steps in 20.2.2.
If the burner does not start up in service mode, turn screw [2] an extra quarter turn counter clockwise, and try again.
Pre adjusting the bottom burner:

Turn setting screw [2] of the lower gas valve clockwise until you feel resistance. This means that the valve is closed; do not try to
tighten the screw any further.

Now turn this screw counter clockwise (open), according to the number of turns in TABLE 14.2 for the used water heater and gas
type.
→ proceed according to steps in 20.2.3.
If the burner does not start up in service mode, turn screw [2] an extra quarter turn counter clockwise, and try again.
Checking both burners:
→ proceed according to steps in 20.2.4.
percentages shown in 20.1.2
2
PROPANE
G31 P PROPAN
PROPANO
PROPAAN
BUTANE/PROPANE
G30/G31 B/P BUTAN/PROPAN
BUTANO/PROPANO
BUTAAN/PROPAAN
P4BD = 1
P4BD = 2
98